it looks tempting! the author of splam.emuhq.com is working on a *C64 emulator* for the Gameboy Advance™! He’s already busy since a good amount on time and it seems writing a C64 emu for the GBA is more than a challenge!
Promising however that there already is a c64 music demo rom for d/l from his site which has a truckload of c64 tunes included. hopefully soon we can ask splam: are we happy? and if he answers yes, there seem to be no limits anymore to take your collection of c64 games to where you ever want to go and play in a 8bit style!